diff --git a/prometheus/helm-values.yaml b/prometheus/helm-values.yaml
index 349fad2..bba3aa4 100644
--- a/prometheus/helm-values.yaml
+++ b/prometheus/helm-values.yaml
@@ -48,8 +48,9 @@ prometheus:
     # Enable remote write receiver for OTel Collector
     enableRemoteWriteReceiver: true
 
-    # HA: 2 replicas on different worker nodes
-    replicas: 2
+    # Single replica due to cluster resource constraints
+    # Thanos provides HA query capability
+    replicas: 1
     replicaExternalLabelName: prometheus_replica
 
     # Pod anti-affinity for HA